FLASH///VISUALIZER

⚠ PHOTOSENSITIVITY WARNING: this tool produces intense strobing light. Do not use or share output with anyone who has photosensitive epilepsy. Flashing above 3 flashes/second can trigger seizures.

This is the Flash Visualizer app: drop in a song, tune the text, fonts, images, shapes and effects, then render a beat-synced strobing 1080p video. Free, no watermark, no signup, and your audio never leaves this browser tab. New here? Read how it works.

1 · Music

Drop a music file or click to browse
mp3 · wav · ogg · m4a

2 · Text

Lines to flash (one per line) Font auto-rotates every word. Choose the font pool in the Fonts section below. Black & white text Text flicker (extremely fast, text only)

3 · Fonts

50 producer-culture fonts rotate per word. Untick any you don't want in the mix.

4 · Images (optional)

Drop images or click to browse

Set an image to Kick, Snare or Hi-hat and it flashes on every hit of that drum. "Bass drop" images take over while sustained bass is active. "Any" images stay in the normal rotation. Each thumbnail can also override the fit below. Image fit (default for all images) Image flash chance 35% Black & white images Image flicker (extremely fast, images only)

5 · Shapes

Shape flash chance 25% Which shapes to include

Checkerboard Circle Square Rings Stripes Triangle Dot grid

Black & white shapes

6 · Flash Settings

Flash effect Trigger mode

Beat sensitivity 1.35

Flash every 250 ms

Bass drop detector 0% Sustained heavy bass scrambles the text and glitches the whole frame until it lets up. 0 = off. Content change rate (synced to detected BPM)

Content changes every 1 flash

Flash intensity / duration 180 ms Persistent flicker speed 15 Hz Flicker opacity 40% Invert all colors with the beat (alternates every flash) Color palette

7 · Overlays

Flying objects (launch on every flash) Artifacts (constant texture over the video) Vocal visualizer (follows the vocal band, 260 Hz to 3.4 kHz)

8 · Output

⬇ DOWNLOAD VIDEO

Load a music file to begin.

Render plays the track in real time while capturing the canvas at 1920×1080 / 60fps with the audio muxed in (WebM VP9). Keep this tab focused while rendering. The .webm plays everywhere modern; convert to mp4 with ffmpeg -i in.webm -c:v libx264 -crf 18 out.mp4 if needed.